add nix flake

flake.nix

@@ -0,0 +1,71 @@
+{
+  description = "Redlib: Private front-end for Reddit";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+  };
+
+  outputs = { nixpkgs, crane, flake-utils, rust-overlay, ... }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import rust-overlay) ];
+        };
+
+        inherit (pkgs) lib;
+
+        rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+          targets = [ "x86_64-unknown-linux-musl" ];
+        };
+
+        craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
+
+
+        src = lib.cleanSourceWith {
+          src = craneLib.path ./.;
+          filter = path: type:
+            (lib.hasInfix "/templates/" path) ||
+            (lib.hasInfix "/static/" path) ||
+            (craneLib.filterCargoSources path type);
+        };
+
+        redlib = craneLib.buildPackage {
+          inherit src;
+          strictDeps = true;
+          doCheck = false;
+
+          CARGO_BUILD_TARGET = "x86_64-unknown-linux-musl";
+          CARGO_BUILD_RUSTFLAGS = "-C target-feature=+crt-static";
+        };
+      in
+      {
+        checks = {
+          my-crate = redlib;
+        };
+
+        packages.default = redlib;
+        packages.docker = pkgs.dockerTools.buildImage {
+          name = "quay.io/redlib/redlib";
+          tag = "latest";
+          created = "now";
+          copyToRoot = with pkgs.dockerTools; [ caCertificates fakeNss ];
+          config.Cmd = "${redlib}/bin/redlib";
+        };
+      });
+}